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<
apalos >
anyone remembers if we can call unmap_sysmem(NULL); on all platforms?
10:33
<
apalos >
or we should not be calling it on NULL?
10:36
<
apalos >
right i think the only implication would be sandbox with pci enabled (??)
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<
mwalle >
marex: sorry, didn't see your message, yeah i'm actually one of the maintainers
13:24
<
mwalle >
(and also my employer makes products with winbond flashes)
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<
marex >
mwalle: pfft
16:45
<
marex >
mwalle: with or without SR3 ?
16:56
<
mwalle >
marex: without ;)
16:56
<
mwalle >
marex: we just protect the bootloader and assert WP#
16:57
<
mwalle >
marex: back in the days, each time you forgot to deassert WP# during development, u-boot and linux would gladly disable all your locking bits and you'll end up with an unprotected flash
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<
mwalle >
marex: and during my research, that "unlock all" misfeature was just there because there are flashes where the locking bits are volatile and after power-up are set. But it was implemented for all flashes
16:58
<
mwalle >
*i found out
17:01
<
mwalle >
and it was a PITA to revert that while somehow retaining backwards compatibility. That's why your "just disable the WPS bit" (thinking it was unconditional) triggered me
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<
marex >
mwalle: good for you
18:38
<
marex >
mwalle: nWP should be hardware protection, right ?
18:39
<
marex >
mwalle: I mean, if nWP is low, then no writes can happen to the SPI NOR or status registers, period, no matter what you do on the SPI bus
18:39
<
marex >
mwalle: I suspect the unlock_all stuff was there to reset protection on SPI NORs which misbehaved, that's why I added this fixup there too
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<
mwalle >
marex: yeah if WP# is low (and the lock bit in the status register is set IIRC) you cannot execute the WREN command
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